/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.apache.flink.client;

import org.apache.flink.api.dag.Pipeline;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.jobgraph.JobGraph;
import org.apache.flink.streaming.api.graph.StreamGraph;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.apache.flink.util.Preconditions.checkArgument;

/**
 * {@link FlinkPipelineTranslator} for DataStream API {@link StreamGraph StreamGraphs}.
 *
 * <p>Note: this is used through reflection in
 * {@link org.apache.flink.client.FlinkPipelineTranslationUtil}.
 */
@SuppressWarnings("unused")
public class StreamGraphTranslator implements FlinkPipelineTranslator {

	private static final Logger LOG = LoggerFactory.getLogger(StreamGraphTranslator.class);

	@Override
	public JobGraph translateToJobGraph(
			Pipeline pipeline,
			Configuration optimizerConfiguration,
			int defaultParallelism) {
		checkArgument(pipeline instanceof StreamGraph,
				"Given pipeline is not a DataStream StreamGraph.");

		StreamGraph streamGraph = (StreamGraph) pipeline;
		return streamGraph.getJobGraph(null);
	}

	@Override
	public String translateToJSONExecutionPlan(Pipeline pipeline) {
		checkArgument(pipeline instanceof StreamGraph,
				"Given pipeline is not a DataStream StreamGraph.");

		StreamGraph streamGraph = (StreamGraph) pipeline;

		return streamGraph.getStreamingPlanAsJSON();
	}

	@Override
	public boolean canTranslate(Pipeline pipeline) {
		return pipeline instanceof StreamGraph;
	}
}
